199237993 has 2 divisors, whose sum is σ = 199237994. Its totient is φ = 199237992.

The previous prime is 199237957. The next prime is 199238003. The reversal of 199237993 is 399732991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151462249 + 47775744 = 12307^2 + 6912^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199237993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 199237993.

It is not a weakly prime, because it can be changed into another prime (199237393) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99618996 + 99618997.

It is an arithmetic number, because the mean of its divisors is an integer number (99618997).

Almost surely, 2^199237993 is an apocalyptic number.

It is an amenable number.

199237993 is a deficient number, since it is larger than the sum of its proper divisors (1).

199237993 is an equidigital number, since it uses as much as digits as its factorization.

199237993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686, while the sum is 52.

The square root of 199237993 is about 14115.1688973246. The cubic root of 199237993 is about 584.0598950657.

The spelling of 199237993 in words is "one hundred ninety-nine million, two hundred thirty-seven thousand, nine hundred ninety-three".